Good morning DIY DRONES,
You guys are my only hope as I have tried everything I can to fix this problems but it seems like an never ending journey.
So, let's me start by saying that I have followed and researched about every possible way to build a TBS Discovery with Pixhawk but my knowledge is still very limited, as I keep on reading, I feel like I have made so many stupid mistake.
So my TBS build list:
TBS Discovery w/ core.
900kv TBS motors and bulletproof escs
9x5 propellers
Pixhawk w/ GPS
4500mah 4s battery.
I have been facing so many problems since thay day I switch from 750kv to 900kv, as everybody said the samething, 900kv is way much better, better bearing, i choose 900kv for long flight etc...
After I install the 900kv on my tbs, everything started to fall apart, Mag_field is really high, over 680 :( Vibration is absolutely ridiculous (eventhough my X+Y axis is still under range but my Z is way beyond measure). My quad could not hold position or altitude, when I fly in stabilize mode it seems to be okie but when i switched from stabilize to either Loiter or Altitude hold, the quad started shooting up and down just like when you change throttle from lowest position to highest in a matter of second. I have to switch to stabilize mode immediately other it will keeps going up.
Could you guys please help me to make this right, i'm truly desperate, i have tried everything but non of them seems to work.
Please find my attachment for the log file, i have tried to fly it as long as i can to review the problems. Please DIYDrones, you are my only hope. 2014-09-12%2023-29-04.log
P/s: I have calibrated all escs, compass, etc.. I followed the introduction closely but non seems to work
Replies
Anyone? Please help me
Your props may be too small,
Why don't you go back to the 750 motors?, with 10 or 11 inches props?
The center of gravity isn't the problem here as when I fly I will add some counter weight at the front. For the 750kv motors, as
I'd ditch the loom. I found with my pixhawk hard plastic loom rattled against the case and caused vibrations. I ran some electrical tape around the body to tape it flat - so it wouldn't hit the pixhawk. Now my vib's are sub -10 for z and ~ 3-5 for x and y.
Get Kyosho zel gel its green as your anti vibration. Its really good stuff.
I'm mounting it on a 4 1x1 pieces of Kyosho zel as well. But it doesn't help that much lol :D
I would try it out, but how do you mount your pixhawk? on gel pad?
I can't understand the vibration clearly, but as I can see alot of people using CC3D on pixhawk without any vibration mount. Please correct me if I'm wrong. I know that there is load of functions ont he pixhawk and best of all it is opensource. But will it be a whole lot easier for user to use something that is vibration free? Why don't 3DR just build in a internal vibration damping?
Thanks,
Long
I think the 750kv would have given you longer flight time. But not to say a big difference.
You will need to retune the PIDs abit as now you are running a faster motor and the old 750kv setting may not work well. You may need to tone it down a bit.
Thanks Randy Ram,
I used SeanM PID for both my 750kv and 900kv, his PID was really good baseline (as he used that PID to run on a 900kv not 750kv). It is very strange that when I use his PID (designed for 900kv) for a my 750kv it worked a lot better.
I want to try the auto-tune function but it won't not hold altitude, so i don't what to do next.
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